Ito calculus without probability in idealized financial markets

Details Ito calculus without probability in idealized financial markets Ito calculus without probability in idealized financial markets

2011-08-03

arxiv.org/abs/1108.0799v1

Economy

Quantitative Finance

Trading and Market Microstructure

25 pages

Scientific paper

We consider idealized financial markets in which price paths of the traded securities are cadlag functions, imposing mild restrictions on the allowed size of jumps. We prove the existence of quadratic variation for typical price paths, where the qualification "typical" means that there is a trading strategy that risks only one monetary unit and brings infinite capital if quadratic variation does not exist. This result allows one to apply numerous known results in pathwise Ito calculus to typical price paths; we give a brief overview of such results.

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